ver·sus [vur-suhs, -suhz] - a preposition
1. against (used especially to
indicate an action brought by one party against another, or to denote
competing teams or players in a sports contest): Smith versus Jones;
Patriots versus Colts.
2. as compared to or as one of two choices; in contrast with: one
player versus two players.
(source: Dictionary.com Unabridged)